A Multi-Motor Architecture for Electric Vehicles

This paper proposes an architecture for EVs with three or more electric motors and highlights when adding more motors does not impact the battery state of charge (SOC). The proposed control algorithm optimizes the use of the motors onboard to keep them running in their most efficient regions. Simulation results along with a comparison with other current motors used in EVs is presented in this paper, and further discussion on the results is presented. With this architecture, the powertrain would see a combined efficiency map that incorporates the best operating points of the motors. Therefore, the proposed architecture will allow the EV to operate with a higher range for a given battery capacity

Un estudio acerca de la influencia de los mecanismos no operacionales en la efectividad de lagobernanza de tecnología de la información pública

Neste estudo, os autores propõem uma análise dos mecanismos não operacionais que podem impactar na efetividade da governança da tecnologia da informação na administração pública. Nesta pesquisa utilizou-se um questionário, o qual foi aplicado em gestores da área de tecnologia da informação e profissionais experientes na área de governança de tecnologia da informação que trabalham em organizações da administração pública. A partir dos dados coletados, aplicou-se a técnica de equações estruturais para verificar o impacto dos seguintes mecanismos na efetividade da governança de tecnologia da informação: suporte da alta administração; atuação do comitê de direção de tecnologia da informação; utilização do planejamento estratégico de tecnologia da informação; atuação da gestão de portfólio de investimentos de tecnologia da informação. Os resultados indicam que os três primeiros mecanismos não têm influência sobre a efetividade percebida da governança de tecnologia da informação do setor público. Porém, a atuação da gestão de portfólio de investimentos de tecnologia da informação influencia direta e positivamente a efetividade, sendo que também através da sua presença como variável mediadora, é que a atuação do comitê de tecnologia da informação passa a ter efeito significativo sobre a efetividade da governança de tecnologia da informação pública. Com os resultados obtidos e a análise destes efeitos, este trabalho almeja contribuir teoricamente para a literatura de governança de tecnologia da informação dentro do contexto em que existem poucas pesquisas que examinam quais mecanismos contribuem para estabelecer essa efetividade dentro das organizações públicas, sendo este número ainda mais incipiente quando o ambiente se restringe ao setor público brasileiro.This study proposes an analysis of non-operational mechanisms that can impact the effectiveness of information technology governance in the Brazilian public administration. A questionnaire was sent to information technology managers and experienced professionals in the area of information technology governance, who work in public organizations. Based on the collected data, we used the structural equations technique to verify the impact of the following mechanisms on the effectiveness of information technology governance: top management support; performance of the information technology steering committee; use of information technology strategic planning; performance of the information technology investment portfolio management. The study indicates that the first three mechanisms do not influence the perceived effectiveness of information technology governance in the Brazilian public sector. However, the performance of the information technology investment portfolio management has a direct and positive consequence on effectiveness; also, as a mediating variable, it significantly affects the performance of the information technology steering committee, increasing the effectiveness of Brazilian public information technology governance. Through the achieved results and the analysis of these effects, this study aims to contribute theoretically to the literature on information technology governance, as there are few studies that examine which mechanisms assist to establish this effectiveness in public organizations, and even less when it comes to the Brazilian public sector.En este estudio los autores proponen un análisis de los mecanismos no operacionales que pueden influir en la efectividad de la gobernanza de tecnología de la información en la administración pública. Se ha aplicado un cuestionario a gestores del área de tecnología de la información y a profesionales experimentados en el área de gobierno de tecnología de la información que trabajan en organizaciones de la administración pública. Se ha aplicado a los datos recogidos la técnica de ecuaciones estructurales con el fin de verificar la influencia de los siguientes mecanismos en la efectividad de la gobernanza de tecnología de la información: apoyo de la alta dirección; actuación de la comisión de dirección de tecnología de la información; utilización del plan estratégico de tecnología de la información; actuación de la gestión de cartera de inversiones de tecnología de la información. Los resultados indican que los tres primeros mecanismos no tienen influencia en la efectividad percibida de la gobernanza de tecnología de la información del sector público. Sin embargo, la actuación de la gestión de cartera de inversiones de tecnología de la información influye directa y positivamente en la efectividad; además, es por medio de su presencia como variable mediadora que la actuación de la comisión de tecnología de la información logra tener un efecto significativo sobre la efectividad de la gobernanza de tecnología de la información pública. Con este trabajo, mediante los resultados obtenidos y el análisis de estos efectos, se pretende contribuir teóricamente a la literatura de gobernanza de tecnología de la información, en un contexto en que se observan pocos estudios dedicados a examinar cuáles mecanismos contribuyen a establecer esta efectividad dentro de las organizaciones públicas, y siendo este número aún más reducido cuando el ambiente se limita al sector público en Brasil

Analytical BPS Maxwell-Higgs vortices

We have established a prescription for the calculation of analytical vortex solutions in the context of generalized Maxwell-Higgs models whose overall dynamics is controlled by two positive functions of the scalar field. We have also determined a natural constraint between these functions and the Higgs potential allowing the existence of axially symmetric Bogomol'nyi-Prasad-Sommerfield (BPS) solutions possessing finite energy. Furthermore, when the generalizing functions are chosen suitably, the nonstandard BPS equations can be solved exactly. We have studied some examples, comparing them with the usual Abrikosov-Nielsen-Olesen (ANO) solution. The overall conclusion is that the analytical self-dual vortices are well-behaved in all relevant sectors, strongly supporting the generalized models they belong themselves. In particular, our results mimic well-known properties of the usual (numerical) configurations, as localized energy density, while contributing to the understanding of topological solitons and their description by means of analytical methods.Comment: 8 pages, 4 figure

Attractiveness of free and open source software projects: theoretical importance and strategies for management

Thousands of Free and Open Source Software Projects (FSP) were, and continually are, created on the Internet. This scenario increases the number of opportunities to collaborate to the same extent that it promotes competition for users and contributors, who can guide projects to superior levels, unachievable by founders alone. Thus, given that the main goal of FSP founders is to improve their projects by means of collaboration, the importance to understand and manage the capacity of attracting users and contributors to the project is established. To support researchers and founders in this challenge, the concept of attractiveness is introduced in this paper, which develops a theoretical-managerial toolkit about the causes, indicators and consequences of attractiveness, enabling its strategic management

New Power Electronics Converter Interfacing a Hybrid Dc/Ac Microgrid

poster abstractDistributed loads can either be ac or dc. It is also possible to combine ac and dc subgrids to form the hybrid microgrid. The main advantage of the hybrid microgrid is that it has higher efficiency and lesser power conversion. In this work is proposed a new integrated power electronics converter able to connect a Distributed Generation (DG) unit with a hybrid dc/ac microgrid. The main advantage of the proposed circuit is the high level of integration by reducing one switch and drive circuitry. However the proposed circuit maintains the same features of the conventional solution (converter with six switches) such as: (i) bidirectional power flow between dc and ac micro grids, (ii) independent control in both ac and dc parts, and (iii) different operation conditions using a unique power conversion circuit. While proposing this new solution, this work also presents its models as well as an analysis of the converter in terms of its operation and Pulse-Width-Modulation (PWM) strategy. Furthermore, the power flow among ac and dc links and the hybrid microgrid will be demonstrated, highlighting the bidirectional characteristic of the converter. The outcomes of this research will be presented through a set of simulation results obtained by using the PSIM software. In order to demonstrate that this converter could be used successfully in a hybrid ac/dc micro grid environment, different operation modes have been selected, such as ac and dc links demanding energy from the DG (ModeI), dc microgrid demanding energy while the ac link is disconnected (ModeII), ac link demanding energy while the dc link is disconnected (ModeIII), and two modes in which ac and dc microgrids are generating power to the system respectively (Mode IV and V)